To be smog exempt in California, a vehicle generally has to fit one of a few defined categories: it’s old enough, new enough, powered by the right fuel, heavy enough, a motorcycle or trailer, a properly insured collector car, or temporarily located outside the state. Most exemptions apply automatically when your registration renewal notice is generated. A few require paperwork or a specialized inspection.
Vehicles That Never Need a Smog Check
The California DMV treats the following categories as fully exempt from smog inspection, regardless of whether you’re renewing registration or transferring ownership:
- Gasoline vehicles from 1975 or older
- Electric vehicles
- Diesel vehicles from 1997 or older
- Diesel vehicles over 14,000 pounds GVWR, any model year
- Natural gas vehicles over 14,000 pounds GVWR
- Motorcycles
- Trailers
If your vehicle fits one of these descriptions, the renewal notice from the DMV will not list a smog certificate as a requirement, and you don’t need to file anything to claim the exemption.1California State Department of Motor Vehicles. Smog Inspections
One boundary worth noting: diesel vehicles from 1998 and newer that weigh 14,000 pounds or less are not exempt. They go through regular smog inspections like any gasoline vehicle.
Newer Vehicles Pay a Fee Instead
Gasoline, hybrid, and alternative-fuel vehicles less than eight model years old skip the biennial smog inspection at renewal. In place of the inspection, you pay an annual smog abatement fee with your registration.1California State Department of Motor Vehicles. Smog Inspections
This isn’t a permanent exemption. Once your vehicle crosses the eight-model-year mark, the next renewal will require a smog check at a licensed station.
Selling or Buying a Vehicle Under Four Model Years
When ownership changes, the seller normally provides a valid smog certificate to the buyer. Gasoline, hybrid, and alternative-fuel vehicles less than four model years old are the exception. No inspection is required for the transfer. The new owner instead pays an $8 smog transfer fee when the vehicle is registered in their name.2California State Department of Motor Vehicles. Registration Fees1California State Department of Motor Vehicles. Smog Inspections
If you’re buying a car in that four-year window from a private party, both sides sometimes assume a smog check is needed. It isn’t.
Collector Vehicles
Collector vehicles are handled differently depending on model year, and only the oldest are fully exempt.
A 1975 or older gasoline vehicle is exempt under the age rule, collector insurance or not.3Bureau of Automotive Repair. Collector Cars
Collector vehicles from 1976 and newer that are insured as collector cars qualify for an abbreviated smog inspection, but they cannot use a regular smog station. The inspection must be done by a state Referee through the Bureau of Automotive Repair’s Smog Check Referee Program. At the appointment, the Referee confirms that the vehicle meets the collector car criteria, verifies your collector insurance, and then performs a shortened check: a tailpipe emissions test, a functional fuel cap test, and a visual inspection for liquid fuel leaks.3Bureau of Automotive Repair. Collector Cars
Vehicles classified as special interest vehicles get an additional check for whether they remain unaltered from manufacturer specifications. Engine or emissions modifications can make that harder to pass. Referee appointments have limited availability, so schedule before the renewal deadline arrives.
Vehicles Located Out of State at Renewal Time
If your California-registered vehicle is physically outside the state when the registration comes due, you can apply for a temporary smog exemption instead of letting the registration lapse. File form REG 5103, Application for Temporary Smog Exemption for a Vehicle Located Out-of-State, and mail it to the DMV with your renewal payment.4California Department of Motor Vehicles. REG 5103, Application for Temporary Smog Exemption for a Vehicle Located Out-of-State
The form asks for the vehicle’s information and the out-of-state address where it’s garaged. It’s signed under penalty of perjury, so it’s not a workaround for a car sitting in your California driveway. A REG 256 Statement of Facts can serve the same purpose. Send it early enough for the DMV to process the paperwork before your registration expires.
Active-duty military stationed outside California do not receive an automatic smog exemption. If the vehicle stays registered in California, the smog check requirement stays with it. Service members whose vehicle is actually located out of state can use the REG 5103 process like any other owner.5California State Department of Motor Vehicles. Vehicle Information for Military Personnel in California
How to Confirm Your Vehicle’s Status
Your registration renewal notice is the plainest answer. If a smog check is required, the notice will say so; if your vehicle is exempt, the requirement won’t appear.
For a second check, the Bureau of Automotive Repair has an online lookup that shows a vehicle’s smog check history and whether a current certificate is on file with the DMV. You can search by VIN or license plate number, and the records update daily.6Bureau of Automotive Repair. Check a Vehicle’s Inspection History
Collector car owners can use the same site to find Referee station locations and schedule the specialized inspection.3Bureau of Automotive Repair. Collector Cars